An imaging method based on passive terahertz security imaging system
An imaging method and imaging system technology, applied in the field of terahertz security inspection imaging, can solve the problems of expensive high-quality detection arrays and inability to adapt to high-speed crowd flow, and achieve the effects of reducing equipment costs, high-precision human body imaging, and improving control speed
Active Publication Date: 2016-04-06
BEIJING AEROSPACE YILIAN TECH DEV
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Problems solved by technology
However, due to the high cost of high-quality detection arrays, limited detectors and quasi-optical antenna scanning imaging methods are basically used at present. The antenna scanning methods mainly include wedge-shaped rotating scanning, mirror rotating scanning, and rotating mirror flat scanning. These scanning methods are often It needs to balance between high resolution and high speed, and cannot adapt to the occasion of high-speed crowd flow
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[0018] Such as figure 1 with figure 2 As shown, a basic passive terahertz security imaging system includes a plane mirror 1, a condenser mirror 2 and a receiving antenna 3. The plane mirror is used to scan the field direction of the measured object 4, and the condenser mirror is used to receive the reflected light of the plane mirror and converge the Gaussian beam , the receiving antenna is used to receive the reflected light information received by the condenser, and transmit the reflected light information to the receiving antenna; the condenser is an ellipsoidal mirror, and a wedge mirror 5 is also arranged between the ellipsoidal mirror and the receiving antenna. The surface mirror receives the reflected light information of the ellipsoidal surface mirror, completes the scanning of the measured object in the row direction, and reflects the reflected light information to the receiving antenna, wherein the flat mirror is a pitching flat mirror whose mirror surface faces the...
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The invention discloses an imaging method based on a passive terahertz security imaging system, comprising the following steps: a plane mirror pitches and swings to scan a measured object in the field direction; an elliptic spherical mirror condenser converges scanning light reflected by the plane mirror into a Gaussian beam; and a wedge mirror rotates to receive reflected light information of the elliptic spherical mirror to complete scanning of the measured object in the line direction. The imaging method of the invention has the advantages that the terahertz wave human body security imaging scanning control speed can be improved, the advantages of rotating scanning and pitching scanning are integrated, rapid and high-definition human body imaging is realized, the method does not need a large number of detector arrays, and the equipment cost can be reduced greatly.
Description
technical field [0001] The invention belongs to the technical field of terahertz security imaging technology, and in particular relates to an imaging method based on a passive terahertz security imaging system. Background technique [0002] Terahertz wave imaging technology has important application value in the fields of security inspection, aircraft navigation, medical diagnosis, military investigation, etc., especially in security inspections in areas where people are highly concentrated for concealed contraband inspections, terahertz wave imaging technology has a natural Advantage. The passive terahertz human body security imaging system realizes the detection of contraband by detecting the intensity difference of terahertz waves in a specific area. The system has the advantages of high penetration, all-weather work and no active radiation of electromagnetic waves. However, due to the immature domestic technology, the terahertz wave imaging effect is not ideal, which b...
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IPC IPC(8): G01V8/10
Inventor 李刚王卓高翔丁青段玮倩郝丛静何君
Owner BEIJING AEROSPACE YILIAN TECH DEV